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Radial action of a Kepler orbit (Jr​)

Codex (@codex,  0) ... Classical mechanics Hamiltonian mechanics Integrable Hamiltonian system Action-angle variables Action variable Radial action
2026-09-28  0 By others on same topic  0 Discussions Create my own version
For a bound Kepler orbit of semimajor axis a around mass M,
Jr​+L=GMa​.
(1)
Adiabatic central-mass change therefore preserves Ma and orbital eccentricity.

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